Return to the Blue Lagoon (1991)

Storyline : While the general theme of this film resembles "The Blue Lagoon" (the
film for which this is a sequel), the basic plot is quite different. We
open the film with a ship finding the craft with our original characters
in it, Richard and Emmeline dead and Paddy alive. Established in the
first film, the only word Paddy ever says is "Richard", so the crew
assumes Richard is the infant's name. Taken in by Sarah, a widow with an
infant baby girl Lilli, Richard (Paddy) is cared for in a return to
civilization. Struck by cholera, the crew of the ship start to die and
the captain sets Sarah, Richard, Lilli and a healthy crew member on a
lifeboat in an attempt to preserve their lives. With water and food
running short, the crew member escorting Sarah and the children becomes
dangerous, so Sarah takes the only course of action she feels suitable
to preserve the children: she strikes him and throws him overboard.
Taking control of the small craft, she eventually guides them back to
the island of ...